The conclusion that I have come to with the LR3 is that things must be fixed preemptively. If you hear that a person has a particular problem with their rig, take a thorough look at yours to make sure you are not next. I was able to dodge the bullet in regards to the "rear upper hatch arms" because I read about it in some other forum, took a look at my LR3, saw the arm screws were loose, and secured them with Loc-tite before they completely separated.
I wasn't so fortunate with the whole water leak issue. Though I had read numerous post regarding blocked sunroof drains, I thought it was just a random issue and wouldn't happen to me. A few weeks ago we had some heavy rain. The next day neither key fob would unlock the vehicle. After much online searching, I found the problem to be wiring that had corroded due to water coming in. I had to remove the first and second row seats, pull up the carpet, dry everything out, and re-solder the wiring. It was a HUGE pain in the rear. The sound deadening material under the carpet was soaked like a sponge in many places, and there was even a small pool of water in one of the wiring channels. The wiring looms are held together by some sort of cloth tape which had mold growing on it due to the moisture.
I also took the time to "circumcise" all four drain tube ends. When I removed the front plastic fender arches, a huge clump of dirt and leaves fell down. All of this debris had entered via the opening between the hood and the windshield. My suspicion is that this might have played a significant role in not allowing water to properly drain.
I've learned my lesson. From now on, if I hear of a potential problem, I will check it out ASAP. The next thing on my list is to make sure there is no water ingress from the windshield cowl as mentioned in the above posts.